PROGRAMMABLE LIGHTING CONTROL SYSTEM WITH NORMALIZED DIMMING FOR DIFFERENT LIGHT SOURCES.

摘要

A lighting control system including a switching means (50) connected between an AC power source (S) and any of a plurality of different types of light sources (LS). The switching means (50) is operable in either an ON or OFF state to selectively apply power to a light source (LS) selected from a plurality of different types of light sources. A switch control means (52) controls the operating state of the switching means (50), and includes means (54, 64) responsive to changes in a dimming control signal for adjusting the phase angle at which said switching means (50) changes its ON/OFF state during each half-cycle of an AC waveform produced by the AC power source (S). Thereby, the power applied to said light source (LS) is adjustable between a minimum and maximum level. The phase angle is within a range which difers for each light source type in order to adjust the light output for each light source type between maximum and minimum levels. A display means (63) displays instantaneous light level of a light source (LS) controlled by the system over a predetermined range of values. A normalizing means (52) normalizes the system performance for different types of light sources so that said display (63) displays the instantaneous light level for all of said different types of light sources over the same predetermined range of values.